batgrbproduct analysis for trigger=1418729

batgrbproduct Analysis for Trigger=1418729

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time (local time): Sat Feb 28 18:31:16 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1418729
======================================================================

  Trigger: 01418729      Segment: 000

  BAT Trigger Time: 786299227.136   [s; MET]
      Trigger Stop: 786299228.16   [s; MET]
               UTC: 2025-12-01T16:26:30.351160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 6.40853981469526   Dec: -44.237098764362  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.62
     Image Trigger?:     NO
     Rate S/N Ratio:     26.9814751264641  [ if not an image trigger ]
     Image S/N Ratio:    12.62

  Flight Position:   [ source = BAT ]
    RA: 6.40853981469526   Dec: -44.237098764362  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 6.40710868429784   Dec: -44.2362145265806  [deg; J2000]  
        { 00h 25m 37.7s , -44d 14' 10.4" }
         +/- 0.797360504735336 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.257102342079769 [arcmin] (formal 1-sigma fit error)
    SNR: 42.0350566353482
 
  Angular difference between Flight and Ground position is 0.081238 arcmin
 
  Partial Coding Fraction: 0.8515625    [ including projection effects ]

  Duration
     T90: 160 +/- 80
        Measured from: -15.1360000371933
                   to: 144.863999962807     [s; relative to TRIGTIME]
     T50: 32 +/- 16
        Measured from: 0.863999962806702
                   to: 32.8639999628067     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.3639999628067     
                   to: 9.3639999628067     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.1360000371933     
                   to: 288.863999962807     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.095411   2.590839   1.942893   0.571500
           0.101940   0.106657   0.090036   0.073805 [error]
 Peak      0.026776   0.040356   0.033120   0.008737
           0.006953   0.007498   0.006557   0.005273 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1    Band2    Band3    Band4    Band5    Total      
                       15-25    25-50   50-100  100-350   15-150   15-350   keV
Fluence   Power-law 6.20e-07 1.10e-06 1.49e-06 4.16e-06 4.32e-06 7.39e-06   erg/cm2
              Error 5.23e-08 5.44e-08 8.95e-08 5.54e-07 2.15e-07 6.13e-07   erg/cm2
Peak flux Power-law 2.55e-01 2.89e-01 2.35e-01 3.19e-01 8.95e-01 1.10e+00   ph/cm2/s
              Error 8.84e-02 6.20e-02 5.22e-02 1.49e-01 1.73e-01 2.14e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.11e-07 1.11e-06 1.50e-06 3.68e-06 4.29e-06 6.90e-06   erg/cm2
              Error 4.78e-08 6.14e-08 9.55e-08 9.84e-07 2.32e-07 1.03e-06   erg/cm2
Peak flux Cutoff-PL 2.35e-01 2.99e-01 2.45e-01 2.05e-01 8.81e-01 9.84e-01   ph/cm2/s
              Error 1.04e-01 7.15e-02 6.04e-02 1.82e-01 1.79e-01 2.55e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.561    0.085    -      -           1.51e-03 7.00e-05   59.220 57
CPL   1.482    0.243     338.3    0.0      1.65e-03 4.62e-04   59.030 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.298    0.326    -      -           7.51e-03 1.41e-03   63.460 57
CPL   0.892    1.618     142.7    0.0      1.19e-02 3.11e-02   63.140 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 81.664000 sec.
T50 in the 50-300 keV band: 24.704000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  304.000  -15.136  288.864
T90   160.000  -15.136  144.864
T50    32.000    0.864   32.864
Peak    1.000    8.364    9.364

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    6.4071   -44.2362   0.0046    30.3592  -164.5732         3.4011525     42.035 TRIG_01418729                 
 
Foreground time interval of the image:
-15.136  14.565 (delta_t =  29.701 [sec])
Background time interval of the image:
-239.136 -15.136 (delta_t = 224.000 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from  -15.136 sec. to  288.864 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.56085     ( -0.0844344   0.0846945 )
Norm@50keV  : 1.51141E-03    ( -7.00912e-05   6.99074e-05 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.22     using 59 bins.
 Reduced chi-squared = 1.03895
# Null hypothesis probability of 3.95e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 304 sec: 0.191947 ( -0.00928  0.009311 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.31951e-06 ( -2.14407e-07  2.15142e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -15.136 sec. to  288.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48168     ( -0.329681   0.155406 )
Epeak [keV] : 338.281      ( -338.313 -338.313 )
Norm@50keV  : 1.65258E-03    ( -0.000204571   0.000719416 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.03     using 59 bins.
 Reduced chi-squared = 1.05411
# Null hypothesis probability of 3.65e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 304 sec: 0.191044 ( -0.009913  0.009479 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.29403e-06 ( -2.36857e-07  2.2696e-07 ) ergs/cm2

Band function

Time interval is from  -15.136 sec. to  288.864 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 15.2586  (  )
R^2/D10^2   : 1.95953E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  178.85     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.68e-14 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.895e-07   2.874e-08
25- 50  1.168e-06   7.509e-08
50-150  1.865e-06   1.628e-07
15-150  3.323e-06   1.870e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-37.7528      -200)
Norm        : 0.776413       (-0.0353983     0.0353983)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.49     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.51e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.885e-07   2.918e-08
25- 50  1.132e-06   5.913e-08
50-150  2.483e-06   1.257e-07
15-150  4.203e-06   2.295e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.87946        (-1.16097      1.27704)
R1^2/D10^2  : 0.217659        (-0.0946681      0.207709)
kT2 [keV]   : 26.8370        (-4.01722      6.35178)
R2^2/D10^2  : 2.16993E-03    (-0.00113687   0.00177995)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.67     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.75e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.733e-07   9.819e-08
25- 50  1.120e-06   1.389e-07
50-150  2.559e-06   4.580e-07
15-150  4.252e-06   5.670e-07

Peak spectrum fit

Power-law model

Time interval is from    8.364 sec. to    9.364 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.29803     ( -0.329198   0.322741 )
Norm@50keV  : 7.50870E-03    ( -0.00141287   0.00140906 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.46     using 59 bins.
 Reduced chi-squared = 1.11333
# Null hypothesis probability of 2.59e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.895494 ( -0.172711  0.173296 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.42438e-08 ( -1.53065e-08  1.55011e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    8.364 sec. to    9.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.891918     ( -1.59667   1.63985 )
Epeak [keV] : 142.702      ( -142.699 -142.699 )
Norm@50keV  : 1.18616E-02    ( -0.00563996   0.0566429 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.14     using 59 bins.
 Reduced chi-squared = 1.1275
# Null hypothesis probability of 2.39e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.881191 ( -0.179223  0.178439 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.2282e-08 ( -1.68194e-08  1.64152e-08 ) ergs/cm2

Band function

Time interval is from    8.364 sec. to    9.364 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 16.9504  (-3.72558  5.32328)
R^2/D10^2   : 6.97722E-02  (-0.0420764   0.0943083)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.05     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.50e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.086e-09   1.459e-09
25- 50  1.804e-08   5.634e-09
50-150  3.697e-08   1.533e-08
15-150  5.909e-08   2.213e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-78.1552      -200)
Norm        : 3.72238       (-0.704258     0.704258)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.89     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.21e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.270e-09   5.430e-09
25- 50  1.783e-08   1.009e-08
50-150  3.911e-08   2.271e-08
15-150  6.621e-08   3.780e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.79145        (-7.4155      -9.79163)
R1^2/D10^2  : 0.297447        (-0.223103      78.7125)
kT2 [keV]   : 37.3051        (-34.9315      -37.3061)
R2^2/D10^2  : 3.75511E-03    (-0.00369805   0.0615573)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.19     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.09e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.473e-09   3.901e-09
25- 50  1.864e-08   1.125e-08
50-150  4.819e-08   2.663e-08
15-150  7.330e-08   3.659e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.28456     ( -0.0662884   0.0658663 )
Norm@50keV  : 7.62959E-03    ( -0.000283125   0.000283065 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.09     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.85e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 29.7 sec: 0.907691 ( -0.0360203  0.0360943 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.24776e-06 ( -8.86714e-08  8.88265e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.978576     ( -0.269463   0.253298 )
Epeak [keV] : 185.302      ( -61.3431 517.052 )
Norm@50keV  : 1.05435E-02    ( -0.00241806   0.00334291 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.77     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.08e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 29.7 sec: 0.893083 ( -0.037861  0.03791 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.21095e-06 ( -9.49776e-08  9.45945e-08 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 1.10e-06
S(50-100 keV) = 1.49e-06

T90 vs. Hardness ratio plot

T90                                   = 160 sec.
Hardness ratio (energy fluence ratio) = 1.35455

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.23643
Count Ratio (50-100 keV) / (15-25 keV) = 0.927213

Mask shadow pattern

IMX = -5.646359361218204E-01, IMY = 1.558106563529533E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-239.136000 -15.136000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 14.5610   8.1057    2.6  29.6   69.7   2.1341   4.4 ------	UNKNOWN

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-15.136000 14.564600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 34.9798  -3.2609    2.8  40.1  106.9   1.2350   4.2 ------	UNKNOWN                       
 32.1847 -32.1942    2.3  37.0  154.1   0.6080   5.1 ------	UNKNOWN                       
  6.4071 -44.2362    0.3  30.4 -164.6   3.4009  42.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
81.764600 711.997300
720.864000 782.912500
840.864000 962.925100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']

Plot creation:
Sun Mar  1 23:12:10 EST 2026